Conrad arldt



No. 608,246. PafentedvAug. 2, |898.

C. ARLDT.

AELECTRICAL SIGNALING APPARATUS FOR TRANSMITTING CMMANDS.

(Application led Dec. 29, 1897.) (No Model.)

we Noms PEYERS co, Ham-uws. MSNM-Jon, c

UNITED STATES PATENT OFFICE.

CONRAD ARLDT, OF BERLIN, GERMANY.

ELECTRICAL SIGNALING APPARATUS FOR TRANSMlTTlNG COMMANDS.

SPECIFICATION forming part of Letters Patent N o. 608,246, dated August 2, 1898.

Application filed December 29, 1897. Serial No. 664,453. (No model.) Patented in England May 7, 1897,11'0. 11,413, and in France May 7,1S97,No.254,366.

To cir/ZZ whom, it may concern/.-

Be it known that I, CONRAD ARLDT, engineer, a subject of the King of Saxony, residing at Berlin, in the German Empire, have invented a certain new and useful Improvement in Electrical Signaling Apparatus for Transmittin g Commands and the Like; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Patents vfor this invention have been obtained in the following countries: Great Britain, No.11,413, filed May 7, 1897, and France, No. 254,366, filed May 7, 1897.

Electrically-operated signaling apparatus for transmitting commands and the like as heretofore employed are more or less unreliable in their working in consequence either 0E the use of interpolated mechanical devices or on account of variations in the potential diierence when their action depended upon changes of resistance eii'ected in the transmitting instrument.

The present invention relates to a construction of electrical signaling apparatus whereby such unreliability is entirely obviated.

I will describemyinvention with reference to the accompanying drawings, in Which- Figures 1 and 2 show vertical sections of one form of the sending and receiving instruments, and Fig. 3 a plan section. Fig. 4 shows a vertical section, and Fig. 5 a plan, of another construction of receiver in which a system of six (or it might be three or other multiple of three) coils e t2 e" t are arranged with their axes parallel to the axis 0f rotation of the magnet.

Referring to Figs. 1, 2, and 3, the transmitter consists of a resistance-coil a, closed on itself, which is supplied with current at two diametrically opposite points by a movable sliding contact-arm b' b2, rotated by means of a movable lever c and connected by leads s .s2 with the source of current. At three points LZ (Z2 (Z3, situated one hundred and twenty degrees apart, this current is taken from the resistance-coil and is conducted, by means of three leads e e2 e3, to the receiving instrument. The latter consists of an arrangement of three or of a multiple` of three coils f ffS, in the magnetic field ot' which is a magnet g with pointer h, mounted on an axis on which it can revolve freely. The coils are here shown as arranged perpendicular-ly to the axis of the pointer. The connections of the circuits are such that the three leads e, e2, and e3 are respectively connected to coils situated at an angle of one hundred and twenty degrees to each other. The other ends of these coils are connected by leads with the entering ends-of the diametrically opposite coils, the other ends of which are connected together by a ringshaped conductor Z.

Referring to Figs. l, 2, and 3, the action of the apparatus is such that a current supplied by means of the opposite sliding contacts b and b2 to the resistance a is so distributed through the leads e' e263 and the receiver-coils ffzf3 that the latter constitute a magnetic field whose direction always corresponds to that of the contact-arm Z) and hand-lever c of the transmitter. In the position shown at Fig. 3, for example, the positive current enters at b and divides in such manner that one part passes through the two half-coils of ct directly to the opposite negative contact b2. This part ot the current has no influence upon the action of the apparatus and by a suitable proportioning of the resistance of a can be made so small as to be negligible. The other portion of the current entering at b divides, one portion going to the rig-ht to CZ and thence to wire d, passing to the outer end of the coil f', which it traverses, and passes out to the common wire Z. The winding of this coil and also that of the coils f2 and f3 is such that if the current ows from outside to inside a north pole is produced at the inside. Consequently in this instance a north pole will be produced at the inner end off. The other portion of the current passes to (Z3 and thence to e3, where it passes to the inner end of the coil f3, thence passi-ng through the coil and out to the common wire Z, thus creating an inner north pole in the magnet f3. The currents which pass to the common wire or ring conductor Z return to the negative pole of the battery. Thus from the ring conductor Zthe current passes to the inner end of the coil f2, thence through thecoil to the wire e2, thence to the arm b2, to the negative pole of the battery. The nort-h poles of f and f3 and the south pole of f2 now form the components of a magnetic field whose direction will be the same as that of coil f2, so that the magnet g and index h will also assume that position, and the latter will therefore have exactly the same position as b and c of the sending instrument. If now b and cbe turned until b2 is brought to d', then the positive current entering at b will divide into two parts, which will. iiow through a till they reach the branches d2 and d3, passing thence through the leads e2 and e3 to the receiver. In the latter the currents will pass through coils f2 and f3 in the direction from without to within, thus forming inner north poles. From f2 f3 the currents pass into the ring conductorl and, joining, pass thence through the coil f from inside to outside, producing an inner south pole, and finally the current passes from f through c and d to b2, and so back to the current-generator. The poles of f fzfs will thus form the components of a magnetic ield the direction of which will correspond to the position of b c and which will bring g and 7L into a corresponding position. By the order of succession of the connections of the points d' d2 cl3 with the coils f f2 f3 this shifting can be made to take place in the same direction as in lthe transmitter or in the opposite direction, at will. On further rotation of the contact-lever b in the transmitter the respective operations and changes of the current are repeated in the coils of the receiver, so that a complete rotary field is produced, which always moves in a synchronous manner with the transmitter-lever. As only these variations of resistance affect the direction of the magnetic field, while the strength of the same-that is to say, the strength of the current introduced into the circuithas no appreciable effect upon this direction, the accuracy of the indications of the pointer is in this invention independent of variations in the potential of the current used.

In apparatus for giving orders, with reply, the transmitter of the one apparatus is connected to the receiver of the other apparatus. It is also possible without further trouble to operate from one transmitter any desired or varying number of receivers simultaneously.

Obviously the arrangement may also be such that in the receiver there is provided a fixed permanent magnet g, while the coils f, which are then provided with a pointer, have their movement in the iield of this constant magnet.

Having now particularly described my invention, what I claim is- 4 In an electrically-actuated signaling apparatus, the combination of a transmitting instrument comprising a closed wire coil, two diametrically opposite rotatable contacts supplying current thereto, three leads connected to the coil at points one hundred and twenty degrees apart and a receiver consisting of three coils connected to the leads and acting upon CONRAD ARLDT.

lVitnesses:

CHARLES H. DAY, HENRY HAsPER. 

